Safety lock



Sept'. 14 1926. l,599(,90l

l s. KwlEclNsKi SAFETY LOCK Filed August 3l 1921 le, ieee.

STANLEY KVJECINSKI, OF IVILVA'UKEE, WSCONSIN.

SAFETY rook.

Application filed August 31,

I have illustrated my invention as embodied in a chest lock, but the i'orm illustrated is merely one olI convenience inasmuch as the invention is applicable to any other .form oit lock which is provided with a sliding bolt.

4The purpose of my invention is the production ot a lock which cannot be operated by an ordinary form ot key, but which re- ]U quircs a key ot special construction, coupled with aknowledge of the peculiar organization ot' the lock in order to operate the same. rlhe invention therefore ai'liords a sate guard against being tampered with, and enables the owner ot the chest to which the lock is applied, to have the assurance that the contents oil the chest will not be disturbed in his absence.

lhe lock embodying my invention is econoinical in construction, and may be applied without diiliculty to the chest or other article which it is intended to secure.

.lleterring now to the drawing which is attached hereto,

Figure 1 is a vertical sectional view the line 1-1, F ig. 3, looking from the front ot a chest ot' ordinary construction, and showing the lock in position.

Fig. 2 is a diagrammatic view of the arrangement of the locking mechanism and showing the manner of its operation.

F is vertical sectional view on the line Fig. 1, looking in the direction ot the arrow, and showing the lock in position on the inside ot the front wall of the Chest.

ln the drawings, the numeral 10 indicates the front wall otl a chest, and 11 the cover thereot. rlhe keeper 12 is attached to the under side ot the cover 11 in the usual manner, the said keeper having one or more projections 14 depending therefrom. These projections are perforated or notched as at 15, in the usual manner ior engagement therewith of the bolt 16 of the lock.

A back plate 17 supports the sliding bolt 16 and its associated mechanism, such bolt being guided in its position by supporting pins or rollers 18 which are carried by the said back plate. The manner ot the en gagement ot the sliding bolt with the keeper of the lock is well known, whereby when the cover of the chest is lowered, it will be retained until reverse movement of the bolt occurs under the influence of the proper key. A spring 19, which may be of any .be supported by 1921. serial No. 497,406.

suitable form is secured at one .end to the back plate 17,`such spring bearing with its free end against the bolt v16 and normally urging,` it into its closed and operative position. rlihe parts thus far .described may be oi' usual and well known form.

Ordinarily the spring pressed slidinff bolt is directly engaged by to reverse the position thereof and open the lock. Locks of that type do not aiford any security against Vbeing tampered with and are easily operated by many keys, and can be picked with various devices or instruments. ln constructing my safety look a depending` thrust member 2O to the bolt 16, engagement oi the free end or point of the member 20 with' the key being necessary to operate the bolt and open the lock. A stop 21 set in the back plate 17 determines the normal position ot' the depending member 2O and a spring 22, ofsuitable form and secured at one end to the back plate 17, urges the said depending member 20. into its position ot' normality.

ik key 23 ,ot peculiar construction may .the post 24 of the lock ,as usual. The said key is provided along the edge ot the bit with a notch 25, extending parallel with the shank thereof. When vthe key is inserted in the look and rotated in the direction or' the full line arrow, Fig. 2, the edge oi the `bit of key will wipe past the tree end o the depending member 20, swinging the latter upon its pivot, against the stress of thespring 22. Vhen the bit passes the tree end ot .the said depending member, the spring 22 immediately snaps the saidmember ito its normal `position in Contact with the stop pin 21. Reverse movement of the key will Vbring the right side oit the bit of the key against the yleft .side of the depending member' 20, without operating the bolt or' the lock. The `operation just described will occur in the event that some one unauthorized to do so, attempts to open the lock. But in the hands of the owner, the key will be slowly turned in the direct-ion ot' the full line arrow in Fig. 2, until the pointed end of the depending member 2O snaps into the notch 25 in the edge of the bit of the key. The parts will then be in the position-shown in Fig. 2, and a reverse movement of the key, or a movement in the direction indicated by the dotted line arrow in the said Fig. 2, will cause the key of the lock I .pivot y the member 2O to act with an angular' thrust upon the latch 1G of the lock, and force the same to the rear against the stress of the spring 19, and thus release the keeper of the lock from its engagement with the bolt, all as indicated by the dotted line positions of the parts in Fig. 2. rIhe cover 11 of the chest may thereupon be raised.

A front plate 26 may be attached to the back plate 17, in the usualv manner to enclose the mechanism of the lock. As an additional means for preventing tampering with the lock, I may attach to the front plate 26 a blade spring 27, such blade being provided with a notched projection 28, which latter extends through a curved slot 29, formed in the front plate 26, as shown in Fig. 1. rIhe notch in the projection 28 will receive the free end of the depending member 20, and prevent the vibration thereof until after the force of the spring 27 has been overcome and the notched projection 28 is Withdrawn from its engagement With the member 20.

To enable the notched member 28 to be disengaged, I bevel the edge thereof at the right of the member 20, as shown at 29 in Fig. 3. Nhen the proper key is applied te the loekand rotated, the bit of the key will engage the bevelled edge 29 of the projection 28, and force the spring 27 outwardly into a recess 30, formed in the front wall of the chest for the clearance thereof. In the further movement of the key, the depending member 2OA will be swung on its pivot, until engagement of the key and point of the said member is effected in the manner hereinbefore described. The projection 28 being Withdrawn from its engagement with the member 20, the further movement of the key will push the member 2O to one side, in which position it will prevent the spring 27 from returning when the key passes the notch therein. The force of the spring 22, being superior to that of the spring 27, will return the member 20 to its knormal position when the key is withdrawn from its engagement with the said projection.

I-Iaving thus described my invention, what I claim and desire to secure by I etters Patent by the United States, is:

1. In a safety lock, a easing, a bolt sliding therein, a depending thrust member pivoted on the bolt, a fixed stop in the casing adapted to limit the movement of the pir'- oted thrust member in one direction, a spring bearing upon the thrust member and acting normally to hold it in engagement with the i'ixed stop, a key for engaging the thrust member and moving it away from the stop to bring the point of the thrust member and the edge oi' the bit of the key into operative engagement, whereby upon reverse movement of the key the thrust member will slide the bolt.

2. In a safety lock, a bolt sliding therein, a depending thrust member pivoted on the bolt, a fixer stop in the easing adapted to limit the movement of the pivoted thrust member in one direction, a spring bearing upon the thrust member` and acting nor mally to hold it in engagement with the said stop, a key having a notched bit for engaging the thrust member and moving it away from the stop against the pressure of the spring to bring the free end of the thrust member and the notched bit of the key into operative engagement, whereby upon reverse movement of the key the thrust member will slide the bolt into unlocking posi; tion.

3. In a safety leek, a bolt sliding therein, a depending thrust member pivoted on the bolt, a fixed stop in the casing adapted to limit'the movement of the pivoted thrust member in one direction, a spring bearing upon the thrust member and acting normally to hold it in engagement with the said stop, a key having a notched bit for engaging the thrust member and moving it away from the stop against the pressure of the spring to bring the free end of the 'thrust member and the notched bit of the l-.ey into operative engagement, whereby upon reverse movement of the key the thrust member will slide the bolt into unlocking position, and a spring having a notched member for engaging the thrust member to retain the latter until the spring is withdrawn by the key.

In testimony whereof, I have signed my name at Milwaukee this 20th day of August. 1921.

S. IVIECINSKI. 

